부산대학교 도서관

Bennett linkage has broad application prospects in civil engineering, aerospace engineering, mechanical engineering, etc. The existence of clearance in the revolute joints makes the journal collide with the bearing and thus affects the dynamic responses of the Bennett linkage. Based on the finite particle method, an effective approach is proposed for the dynamics analysis of the deployment process of the Bennett linkage with revolute clearance joints. Firstly, a simplified computational model of the Bennett linkage is proposed to consider the size effects and contacts. The corresponding beam element, torsion spring element, and face-to-face contact element are derived. Subsequently, the detection method of the axial and radial contact states of revolute clearance joints is presented, and the calculation model of the contact force is depicted. Finally, dynamics analysis of a typical Bennett linkage with clearance joints is carried out. The results of the simplified model are consistent with the higher-fidelity model, demonstrating the effectiveness of the proposed method. The Bennett linkage with clearance joints is observed to exhibit more oscillations than that with ideal joints during deployment, and its energy is dissipated due to the existence of clearance. The increase of the number of the revolute clearance joints leads to more dynamic effects of the mechanism. The increase of clearance size causes more oscillations in the mechanism. The increase of the friction coefficient in revolute clearance joints reduces the oscillations of the mechanism. The growth of the damping coefficient results in more energy dissipation and weakens the additional dynamic response caused by clearance.